What challenges arise when trying to append multiple PDF files together using fpdi in PHP?

When trying to append multiple PDF files together using FPDI in PHP, a common challenge is maintaining the correct page numbering and layout while merging the files. One way to solve this issue is to use the FPDI library along with TCPDF to import the pages from each PDF file and add them to a new document in the desired order. 

require_once('fpdf/fpdf.php');
require_once('fpdi/fpdi.php');

// Create new PDF instance
$pdf = new FPDI();

// Add a page for each PDF file to be merged
$pdf->AddPage();
$pdf->setSourceFile('file1.pdf');
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx);

$pdf->AddPage();
$pdf->setSourceFile('file2.pdf');
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx);

// Output the merged PDF
$pdf->Output('merged_files.pdf', 'F');

Keywords

fpdi PDF files append challenges PHP

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